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I would try Leibish and Co. It's has an online store that has a very big inventory on fancy color diamonds especially yellow but do have some on pink and blue (though very expensive). Majority comes with GIA certificate and a few with IGI (You can view them online if you wish as well). Check out their site, it's reputable and they are Israeli based and they shipped by FedEx expressed (free) if you are ordering from let say US and I do believe they accept paypal, credit cards and bank wire, and offer full refund if you don't like it.
I've purchased several pink diamonds from Leibish- they are great. They have a huge inventory and wonderful customer service. I've also purchased yellow and pink diamonds from Diamonds by Lauren- also very happy with them. I only buy with a GIA report.
jpup- so good to hear from you. I'm going to PM or email you.
jpup is an excellent resource on this topic.